github-electron: Add app.getLocale()

github-electron/github-electron.d.ts

@@ -1022,6 +1022,10 @@ declare module Electron {
 		 * name by Electron.
 		 */
 		getName(): string;
+		/**
+		  * @returns The current application locale.
+		  **/
+		getLocale(): string;
 		/**
 		 * Resolves the proxy information for url, the callback would be called with
 		 * callback(proxy) when the request is done.